CN112581536B - OLED mobile phone screen pixel positioning method based on region growing - Google Patents

OLED mobile phone screen pixel positioning method based on region growing Download PDF

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CN112581536B
CN112581536B CN201910942374.8A CN201910942374A CN112581536B CN 112581536 B CN112581536 B CN 112581536B CN 201910942374 A CN201910942374 A CN 201910942374A CN 112581536 B CN112581536 B CN 112581536B
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桑红石
沈光明
陈曦
李立
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Huazhong University of Science and Technology
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Abstract

The invention discloses a region growth-based OLED mobile phone screen pixel positioning method, which comprises the steps of firstly searching a plurality of non-zero pixels in an input image to be respectively used as seed points, respectively mapping coordinates and pixel values, then searching upper, lower, left and right regions by taking the seed points as references, searching new seeds until all lamp points are searched, and realizing lamp point positioning. Meanwhile, missing abnormal lamp point estimation row and column coordinates are filled, and finally, the image is cut and corrected in odd or even columns, so that the aim of sorting discrete lamp point data is fulfilled. The method provided by the invention mainly aims at the conditions that the OLED screen lamp points are arranged in a staggered mode and the overall outline of the screen is irregular, can accurately complete positioning and has good robustness.

Description

OLED mobile phone screen pixel positioning method based on region growing
Technical Field
The invention belongs to the field of digital image processing, and particularly relates to an OLED mobile phone screen pixel positioning method based on region growth.
Background
First, OLEDs can be fabricated as flexible transparent displays, so that even if the prospects of OLEDs were once unseen, due to the inexorable advantages, OLEDs have been continuously researched and developed, and thus OLED technology is now beginning to enter the market. The organic compounds are various in types and structures, and OLED materials meeting various colors and process requirements can be obtained, so that the OLED display can have rich color choices. And the OLED has a simple structure and fewer production processes, so that the OLED display has the potential of low-cost production. In addition, the OLED display has many features such as wide viewing angle, fast response speed, and high brightness. Is considered to be a new generation of display technology following the replacement of the CRT by the LCD.
For any display device, correction of its luminance uniformity is necessary. Therefore, brightness data of the OLED screen needs to be extracted and compensated, and the lamp point pixels need to be positioned by extracting the brightness data. The pixel positioning can adopt a simple projection method or line-by-line search statistics to determine the position, but the method is only suitable for a display screen with regular pixel arrangement and a rectangular outline, and has certain limitation. For a mobile phone screen with a part of screen body hollowed for placing a camera, the method is more difficult to be applied. Therefore, a method for positioning pixels of an OLED mobile phone screen aiming at staggered screen light points is required.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an OLED mobile phone screen pixel positioning method based on region growing, and aims to solve the problem that the existing mobile phone screen pixel positioning method cannot adapt to the irregular overall outline.
In order to achieve the purpose, the invention provides an OLED mobile phone screen pixel positioning method based on region growth, which comprises the following steps:
s1, searching n light points, namely non-zero pixels a, in the center of the input image A as seedsij≠0；
S2, mapping the coordinates of the seeds into an image B, mapping pixel values into an image C, respectively searching lamp points in four 3 x 3 neighborhoods, namely the upper, the lower, the left and the right, as new seeds by taking the coordinates of the seeds in an input image A as a reference, mapping the coordinates of the new seeds into the image B, and mapping the pixel values into the image C to realize region growth;
s3, repeating the S2 until no new seeds are generated and all the lamp points are searched;
and S4, filling the lamp points with the pixel value of 0 in the image C, and then carrying out shearing and odd and even column correction to realize pixel positioning.
Preferably, the row-column information of the seed mapping in S2 to the image B is represented as:
Figure BDA0002223269720000021
wherein rowk、colkRespectively identifying the row and column coordinates of the seeds k in the image B, wherein k is 1, 2 … … n, n is the number of center light points, the value of n is related to the arrangement of the light points, and the row in the image B iskRocolkThe row and column values of the lamp points of the column in the image A are i respectivelyk、jkH and w respectively represent the maximum row number and the maximum column number of all the lamp points, and Δ h and Δ w respectively represent the deviation values of the maximum row number and the maximum column number.
Preferably, the size of the image B is (h +2 Δ h) × (w +2 Δ w), h, w respectively represent the maximum number of rows and the maximum number of columns of all the light points, and Δ h, Δ w respectively represent the deviation values of the maximum number of rows and the maximum number of columns.
Preferably, the row and column information of the seed mapping in the image C of S2 is represented as:
Figure BDA0002223269720000022
wherein the row in the image CkRocolkColumn pixel value of
Figure BDA0002223269720000023
Preferably, the image C has a size of (h +2 Δ h) (w +2 Δ w), h, w respectively indicate the maximum number of rows and the maximum number of columns of all the lamp spots, and Δ h, Δ w respectively indicate deviation values of the maximum number of rows and the maximum number of columns.
Preferably, if the row and column coordinates of the seed point in the image B are row and col, the specific formula of searching in the four preset size neighborhoods at the upper, lower, left and right sides is as follows:
Figure BDA0002223269720000031
Figure BDA0002223269720000032
Figure BDA0002223269720000033
Figure BDA0002223269720000034
wherein h isOffset、wOffsetThe number of pixels between adjacent rows and columns of the lamp points in the image A, m and n are the row and column variation range of the preset neighborhood, m is more than or equal to-1 and less than or equal to 1, n is more than or equal to-1 and less than or equal to 1, rowOn the upper part、colUpper part of、rowLower part、colLower part、rowLeft side of、colLeft side of、rowRight side、colRight sideAnd respectively representing the row-column coordinates of the new seeds searched by the upper, lower, left and right neighborhoods. And if repeated seed points are searched in the region growing process, row-column mapping is not carried out.
Preferably, the light points with pixel values of 0 are padded, the predicted row and column values are replaced by row and column mean values of the upper, lower, left and right sides of the predicted row and column values, and the pixel values are stored in the image C, and the specific formula is as follows:
Figure BDA0002223269720000041
wherein, ω is(row)(col)Indicates whether or not coordinate information is present in B, and if so, ω(row)(col)Is 1; otherwise, it is 0; g (i, j) is a function of the pixel values of the lamp points in row i and column j in image A.
Preferably, the trimming and number and even column correction in S4 specifically includes the following steps:
s401, traversing the image C line by line, counting the number of non-zero pixels of each line, and enabling the first number to be larger than a threshold value T1The first row is regarded as the first row; similarly, traverse column by columnThe first number is greater than a threshold value T2The column coordinates of FirstCol are regarded as a first column;
s402, counting the proportion of odd columns to even columns in the non-zero pixels of the FirstRow row, wherein the specific formula is as follows:
Figure BDA0002223269720000042
where j is the column coordinate of the non-zero pixels in the FirstRow, w is the maximum column number of all light points, j% 2 represents the remainder of taking 2 for the column coordinate, and s is used to count the sum: if the row coordinate j is an odd number, adding 1; otherwise, subtracting 1; s is divided by the maximum column number w of the lamp points, and the odd-even correction is judged by comparing the s with a threshold value of 0.25;
and S403, performing shearing and parity correction according to h, w, the FirstRow and the FirstCol obtained in the step 401 and the result of S/w in the step 402, and realizing pixel positioning.
Through the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the invention provides a pixel positioning method of an OLED mobile phone screen based on region growing, aiming at solving the problem of how to accurately arrange discrete brightness data according to a certain sequence so as to send the discrete brightness data to a compensation module to realize brightness uniformity correction, and because the searched seed points are used as new seed points to be searched iteratively at each time, the pixel positioning can be finished in a self-adaptive manner for OLED screens with different contours, and the method has good robustness;
2. according to the OLED mobile phone screen pixel positioning method based on the region growing, due to the fact that the mapping relation between the image B and the row and column coordinates in the image A is stored, missing abnormal pixels can be filled, and completeness and accuracy of data are guaranteed.
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FIG. 1 is a schematic flow chart of a method for positioning pixels of an OLED mobile phone screen according to the present invention;
FIG. 2 is a partial enlarged view of an input image A according to the present invention;
FIG. 3 is a schematic view of uncut image C of the present invention;
FIG. 4 is an enlarged partial view of the middle right region of image C of the present invention;
FIG. 5 is a schematic diagram of the first row of odd or even columns requiring correction due to the region growing according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention provides a region growth-based OLED mobile phone screen pixel positioning method, as shown in FIG. 1, comprising the following steps:
s1, searching n lamp points as seeds in the center of the input image A, wherein a partial enlarged view of the image A is shown in FIG. 2, and white points are the lamp points;
s2, mapping the coordinates of the seeds into an image B, mapping pixel values into an image C, respectively searching lamp points in four 3 x 3 neighborhoods, namely the upper, the lower, the left and the right, as new seeds by taking the coordinates of the seeds in an input image A as a reference, mapping the coordinates of the new seeds into the image B, and mapping the pixel values into the image C to realize region growth;
s3, repeating S2 until no new seeds are generated, searching all the lamp points, and obtaining a graph C as shown in FIG. 3, wherein FIG. 4 is a partial enlarged view of the graph C;
and S4, filling the lamp points with the pixel value of 0 in the image C, and then carrying out shearing and odd and even column correction to realize pixel positioning.
Specifically, the row-column information of the seed mapping in S2 into image B is represented as:
Figure BDA0002223269720000061
wherein r isowk、colkRespectively identifying the row coordinates and the column coordinates of the seeds k in the image B, wherein k is 1, 2 … … n, n is the number of central light points, the value of n is related to the arrangement of the light points, and the row coordinate in the image B iskRocolkThe row and column values of the lamp points of the column in the image A are i respectivelyk、jkH and w respectively represent the maximum number of rows and the maximum number of columns of all the lamp points, and Δ h and Δ w respectively represent the deviation values of the maximum number of rows and the maximum number of columns.
Specifically, the size of the image B is (h +2 Δ h) × (w +2 Δ w), h and w respectively indicate the maximum number of rows and the maximum number of columns of all the light points, and Δ h and Δ w respectively indicate deviation values of the maximum number of rows and the maximum number of columns.
Specifically, the row and column information of the seed mapping in the image C at S2 is represented as:
Figure BDA0002223269720000062
wherein the row in the image CkRocolkColumn pixel value of
Figure BDA0002223269720000063
Specifically, the size of the image C is (h +2 Δ h) × (w +2 Δ w), h and w respectively indicate the maximum number of rows and the maximum number of columns of all the light points, and Δ h and Δ w respectively indicate deviation values of the maximum number of rows and the maximum number of columns.
Specifically, if the row and column coordinates of the seed point in the image B are row and col, the specific formula for searching the four preset-size neighborhoods at the upper, lower, left and right sides is as follows:
Figure BDA0002223269720000071
Figure BDA0002223269720000072
Figure BDA0002223269720000073
Figure BDA0002223269720000074
wherein h isOffset、wOffsetThe number of pixels between adjacent rows and columns of the lamp points in the image A, m and n are the row and column variation range of the preset neighborhood, m is more than or equal to-1 and less than or equal to 1, n is more than or equal to-1 and less than or equal to 1, rowOn the upper part、colOn the upper part、rowLower part、colLower part、rowLeft side of、colLeft side of、rowRight side、colRight sideAnd respectively representing the row-column coordinates of the new seeds searched by the upper, lower, left and right neighborhoods. And if repeated seed points are searched in the region growing process, no row-column mapping is carried out.
Specifically, the light points with the pixel value of 0 are filled, the predicted row and column values are replaced by row and column mean values of the upper, lower, left and right sides of the predicted row and column values, and the pixel values are stored in the image C, and the specific formula is as follows:
Figure BDA0002223269720000081
wherein, ω is(row)(col)Indicates whether or not coordinate information is present in B, and if so, ω(row)(col)Is 1; otherwise, it is 0; g (i, j) is a function of the pixel values of the lamp points in row i and column j in image A.
Specifically, the trimming and number and even number row correction in S4 specifically includes the following steps:
s401, traversing the image C line by line, counting the number of non-zero pixels of each line, and enabling the first number to be larger than a threshold value T1The first row is regarded as the first row; similarly, traversing column by column, and enabling the first number to be larger than the threshold value T2The column coordinates of FirstCol are regarded as a first column;
s402, counting the proportion of odd columns to even columns in the non-zero pixels of the FirstRow row, wherein the specific formula is as follows:
Figure BDA0002223269720000082
where j is the column coordinate of the non-zero pixels in the FirstRow, w is the maximum number of columns of all the light points, j% 2 represents the remainder of taking 2 for the column coordinate, and s is used to count the sum: if the row coordinate j is an odd number, adding 1; otherwise, subtracting 1; s is divided by the total column number w of the effective pixels, and the odd-even correction is judged by comparing the s with a threshold value of 0.25;
and S403, performing shearing and parity correction according to h, w, the FirstRow and the FirstCol obtained in the step 401 and the result of S/w in the step 402, and realizing pixel positioning.
Fig. 5 shows the case where the first row of odd or even columns caused by the region growing needs to be corrected. This occurs because the two seed points are randomly selected in image a, which requires correction. Therefore, no matter the OLED screen lamp points are staggered or the overall shape is irregular, the positioning method can accurately and effectively realize positioning.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (7)

1. An OLED mobile phone screen pixel positioning method based on region growing is characterized by comprising the following steps:
s1, searching n lamp points in the center of the input image A as seeds;
s2, mapping the coordinates of the seeds into an image B, mapping pixel values into an image C, respectively searching lamp points in four neighborhoods with preset sizes, namely upper, lower, left and right, as new seeds by taking the coordinates of the seeds in an input image A as a reference, mapping the coordinates of the new seeds into the image B, and mapping the pixel values into the image C to realize region growth;
s3, repeating S2 until no new seeds are generated and all lamp points are searched;
s4, filling the light points with the pixel value of 0 in the image C, replacing the predicted row and column values by row and column mean values of the upper part, the lower part and the left part and the right part, and storing the pixel values in the image C, wherein the specific formula is as follows:
Figure FDA0003630506250000011
wherein, ω is(row)(col)Indicates whether or not coordinate information is present in B, and if so, ω(row)(col)Is 1; otherwise, it is 0; g (i, j) is a function for calculating the pixel value of the lamp point of the ith row and the jth column in the image A; c. C(row)(col)The col column pixel value of the row in the image C; b(row)(col)(y)、b(row)(col)(x) The row and column values of the lamp points in the row col of the row in the image C;
then, the pixel positioning is realized after shearing and odd and even row correction, and the method specifically comprises the following steps:
s401, traversing the image C line by line, counting the number of non-zero pixels of each line, and enabling the first number to be larger than a threshold value T1The first row is regarded as the first row; similarly, traversing column by column, and enabling the first number to be larger than the threshold value T2The column coordinates of FirstCol are regarded as a first column;
s402, counting the proportion of odd columns to even columns in the non-zero pixels of the FirstRow row, wherein the specific formula is as follows:
Figure FDA0003630506250000021
where j is the column coordinate of the non-zero pixels in the FirstRow, w is the maximum column number of all light points, j% 2 represents the remainder of taking 2 for the column coordinate, and s is used to count the sum: if the row coordinate j is an odd number, adding 1; otherwise, subtracting 1; s is divided by the maximum column number w of the lamp points, and the odd-even correction is judged by comparing the s with a threshold value of 0.25;
and S403, performing shearing and parity correction according to h, w, the FirstRow and the FirstCol obtained in the step 401 and the result of S/w in the step 402, and realizing pixel positioning.
2. The OLED mobile phone screen pixel positioning method according to claim 1, wherein the row-column information mapped by the seed in the image B in S2 is represented as:
Figure FDA0003630506250000022
wherein rowk、colkRespectively identifying the row and column coordinates of the seed k in the image B, wherein k is 1, 2 … … n, n is the number of center light points, and the row number in the image BkRow colkThe row and column values of the lamp points of the column in the image A are i respectivelyk、jkH and w respectively represent the maximum row number and the maximum column number of all the lamp points, and Δ h and Δ w respectively represent the deviation values of the maximum row number and the maximum column number.
3. The OLED mobile phone screen pixel positioning method according to claim 2, wherein the size of the image B is (h +2 Δ h) (w +2 Δ w), h and w respectively represent the maximum row number and the maximum column number of all the light points, and Δ h and Δ w respectively represent the deviation value of the maximum row number and the maximum column number.
4. The OLED mobile phone screen pixel positioning method according to claim 1, wherein the row and column information mapped in the image C by the seed of S2 is represented as:
Figure FDA0003630506250000031
wherein the row in the image CkRocolkColumn pixel value of
Figure FDA0003630506250000032
5. The OLED mobile screen pixel location method of claim 4, wherein the size of the image C is (h +2 Δ h) (w +2 Δ w), wherein h and w respectively represent the maximum number of rows and the maximum number of columns of all the light points, and Δ h and Δ w respectively represent deviation values of the maximum number of rows and the maximum number of columns.
6. The OLED mobile phone screen pixel positioning method of claim 1, wherein if the row and column coordinates of the seed point in the image B are row and col respectively, the specific formula of searching in the four neighborhoods with preset sizes at the upper, lower, left and right is as follows:
Figure FDA0003630506250000033
Figure FDA0003630506250000034
Figure FDA0003630506250000035
Figure FDA0003630506250000036
wherein h isOffset、wOffsetThe number of pixels between adjacent rows and columns of the lamp points in the image B, m and n are the row and column variation range of the preset neighborhood, m is more than or equal to-1 and less than or equal to 1, n is more than or equal to-1 and less than or equal to 1, rowOn the upper part、colOn the upper part、rowLower part、colLower part、rowLeft side of、colLeft side of、rowRight side、colRight sideAnd respectively representing the row and column coordinates of the new seeds searched by the upper, lower, left and right neighborhoods.
7. The OLED mobile phone screen pixel positioning method of claim 6, wherein if repeated seed points are searched in the region growing process, no row-column mapping is performed.
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